<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert show-icon title="添加商品信息" type="info" :closable="false" center></el-alert>
      <!-- 步骤条区域 -->
      <el-form
        :model="AddForm"
        :rules="AddRules"
        ref="AddFormRef"
        label-width="100px"
        label-position="top">
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>
        <!-- tab区域 -->
        <el-tabs
          :tab-position=" 'left' "
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="AddForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="AddForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="AddForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="AddForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="AddForm.goods_cat"
                expand-trigger="hover"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action:表示图片要上传的后台api地址 -->
            <el-upload
              action="http://127.0.0.1:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :headers="headersObj"
              list-type="picture"
              style="width=600px"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="AddForm.goods_introduce" />
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="PreviewVisible" width="50%">
      <span>
        <img :src="previewPath"  class="previewImg" />
      </span>
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data() {
    return {
      activeIndex: '0',
      //添加商品表单
      AddForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [], //商品所属的分类数组
        attrs: [],
        pics: [], //图片的数组
        goods_introduce: '' //商品的详情描述
      },
      previewPath: '', //预览图片地址
      PreviewVisible: false, //图片预览弹窗是否展示和影藏
      //添加商品表单验证规则
      AddRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ]
      },
      cateList: [], //商品分类列表
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      manyTableData: [], //动态参数页面数据
        onlyTabData: [], //静态属性页面数据
      goods_cat: [
        { required: true, message: '请选择商品分类', trigger: 'blur' }
      ],
      //图片上传组件的headers请求头对象
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有商品分类
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败！')
      }
      this.cateList = res.data
    },
    //级联选择框选中项变化触发的函数
    handleChange() {
      //判断级联选择框是否选中的是3级菜单，不是就将数组清空
      if (this.AddForm.goods_cat.length != 3) {
        this.AddForm.goods_cat = []
      }
      // console.log(this.AddForm.goods_cate)
    },
    beforeTabLeave(activeName, oldActiveName) {
      // console.log('即将离开的标签页名称'+oldActiveName);
      // console.log('即将进入的标签页名称'+activeName);
      if (oldActiveName === '0' && this.AddForm.goods_cat.length != 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    //点击跳转商品参数页事件
    async tabClicked() {
      // 如果索引=1，则到了商品参数页，发起请求数据
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        //如果索引=2.则访问的是商品属性页面，需要发起对应请求
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败！')
        }
        this.onlyTabData = res.data   
      }
      // console.log(this.activeIndex);
    },
    //处理图片预览效果
    handlePreview(file) {
      // console.log(file);
      this.previewPath = file.response.data.url
      this.PreviewVisible = true
    },
    //处理移除图片的操作
    handleRemove(file) {
      // console.log(file);
      // 1.获取要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pic数组中，找到这个图片对应的索引值
      const i = this.AddForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.AddForm.pics.splice(i, 1)
      // console.log(this.AddForm)
    },
    //监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response);
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      this.AddForm.pics.push(picInfo)
      // console.log(this.AddForm.pics)
    },
    //添加商品
    add() {
      // console.log(this.AddForm);
      this.$refs.AddFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加的业务逻辑
        // lodash   cloneDeep(obj)
        const form = _.cloneDeep(this.AddForm)
        form.goods_cat = form.goods_cat.join(',')
       // 处理动态参数
       if(!this.manyTableData || !this.manyTableData.length) return
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.AddForm.attrs.push(newInfo)
        })
        // 处理静态属性
        if(!this.onlyTabData || !this.onlyTabData.length) return
        this.onlyTabData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.AddForm.attrs.push(newInfo)
        })
        form.attrs = this.AddForm.attrs
        // console.log(form)
        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
       if (res.meta.status !== 201) {  
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')      
      })
    }
  },
  computed: {
    cateId() {
      if (this.AddForm.goods_cat.length === 3) {
        return this.AddForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>
<style  scoped>

.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
  height: 100%;
}
.el-upload-list .el-upload-list__item {
    width: 1000px !important;
}
.btnAdd {
  margin-top: 10px;
}

</style>